Cable Pulling Tension and Sidewall Pressure
Estimate pull tension for a horizontal straight run followed by an equivalent cable bend, expose the key intermediate tensions, and compare them with user-entered installation limits.
Result
Limit comparison
Formula
Calculation logicFormula definitions and substituted values.
Weight Per Length
Cable mass per length (kg/m) * 9.80665
Cable mass per length (kg/m) * 9.80665Estimated tension after straight run (N)
Initial tension entering the straight run (N) + Effective friction coefficient * Weight Per Length * Horizontal straight length (m)
Initial tension entering the straight run (N) + Effective friction coefficient * Weight Per Length * Horizontal straight length (m)Bend Angle Rad
Equivalent bend angle (degrees) * 0.017453292519943
Equivalent bend angle (degrees) * 0.017453292519943Bend tension multiplication factor
exp(Effective friction coefficient * Bend Angle Rad)
exp(Effective friction coefficient * Bend Angle Rad)Estimated exit tension (N)
Estimated tension after straight run (N) * Bend tension multiplication factor
Estimated tension after straight run (N) * Bend tension multiplication factorEstimated sidewall pressure (N/m)
if Equivalent bend angle (degrees) = 0 then 0 else Estimated exit tension (N) / Bend radius (m)
if Equivalent bend angle (degrees) = 0 then 0 else Estimated exit tension (N) / Bend radius (m)Pull tension margin (N)
Manufacturer allowable pull tension (N) - Estimated exit tension (N)
Manufacturer allowable pull tension (N) - Estimated exit tension (N)Sidewall pressure margin (N/m)
Manufacturer allowable sidewall pressure (N/m) - Estimated sidewall pressure (N/m)
Manufacturer allowable sidewall pressure (N/m) - Estimated sidewall pressure (N/m)Limit comparison
Estimated tension exceeds the user-entered allowable pull tension. if Pull tension margin (N) < 0; Estimated sidewall pressure exceeds the user-entered allowable value. if Sidewall pressure margin (N/m) < 0; Both estimates are within the user-entered limits for this simplified route model. otherwise
Estimated tension exceeds the user-entered allowable pull tension. if Pull tension margin (N) < 0; Estimated sidewall pressure exceeds the user-entered allowable value. if Sidewall pressure margin (N/m) < 0; Both estimates are within the user-entered limits for this simplified route model. otherwiseBefore relying on the result
- Checking a planned pull before installation
- Comparing a route or lubricant coefficient against manufacturer limits
- Compare the estimated pull tension and sidewall pressure with the cable and installation equipment manufacturers' stated limits.
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